CN1859292A - Household gateway and method for ensuring household network service terminal QoS - Google Patents

Abstract

The invention relates to digital communication technology, in particular to a home gateway and a method for guaranteeing the QoS of a home network service terminal. A home gateway, the home gateway HGW includes a service type identifier for identifying the service type of the message, a network address translator NAT for converting the source address of the message into a corresponding public network IP address according to the service type, and At least two connection channels connected to the network side equipment for carrying services, and each connection channel can obtain at least one public network IP address. The present invention can effectively prevent unauthorized PC Internet users from using the uplink channel of the service terminal to access the network, so that PC Internet users can freely choose payment methods, and at the same time save IP resources; each terminal can easily realize intercommunication; it can effectively guarantee voice, Both video and data services can get good QoS guarantee.

Description

A home gateway and a method for guaranteeing QoS of a home network service terminal

[technical field]

The invention relates to digital communication technology, in particular to a home gateway and a method for guaranteeing the QoS of a home network service terminal.

[Background technique]

With the current development of communication technology, the digital family has begun to penetrate into real life. There are more and more network devices in the family, and there are more and more types of network-based services, such as personal computer (PC) Internet data services, digital telephone (IP Phone) ) provides VoIP service, BTV/VoD service provided by digital set-top box (IP STB), and video phone service provided by Video Phone. The home gateway (HGW) is at the core of the home network, and all services are carried on the IP network, and are sent to the SP (Service Provider, service provider) network through the same uplink channel through the HGW. These upstream channels are based on IP, which may be one of various transmission technologies such as ADSL/ADSL2+, VDSL/VDSL2, EPON/GPON/GEPON, WiMAX, etc.

FIG. 1 is a network diagram of an existing home network and an access network. In order to enable PCs and various service terminals to provide users with good services, HGW must consider the following issues:

1. Under normal circumstances, the transmission bandwidth inside the home can reach 10M or even 100M, but at the uplink interface, the bandwidth often converges to only 2M or 4M, which is much smaller than the bandwidth inside the home. This leads to a problem: how to guarantee the QoS of various service terminals in the home? At the DSLAM, a large number of service flows converge and there is a bandwidth bottleneck. How to ensure the QoS here? If all data is encapsulated by PPPoE, because the DSLAM has not terminated PPPoE, it cannot identify the data type in the PPPoE encapsulation, so QoS scheduling cannot be performed naturally.

2. There are various terminals such as PC, IP Phone, and IPSTB in the home, and direct intercommunication must be realized between the terminals. For example, IPSTB can play the program source stored on the PC, and IP Phone can obtain the phone book stored on the PC, etc. To achieve direct intercommunication between devices, all terminals are required to use the IP protocol and have IP addresses on the same network segment.

3. The number of terminals in the family is huge, but the address space that the current IPv4 can provide is limited, especially in my country, where IP address resources are seriously lacking. If each terminal in the home occupies a public network IP address, it will cause serious waste of IP addresses. This situation is unacceptable to any SP.

4. At present, most PC Internet users use PPPoE to access the Internet, while Telecom and other SPs provide different billing strategies, such as fixed-fee monthly subscription and timing. However, various business terminals other than PCs need to be connected 24 hours a day. If the network provided to the service terminal is China Unicom, the PC can access the network through this channel, avoiding the billing of the SP. How to prevent unauthorized users from using the uplink channel of the service terminal to access the network is also a problem that the HGW needs to solve.

A solution in the prior art is: PPPoE is the most used method for terminal equipment access, and PPPoE has great advantages for PC-type data access. If there are multiple terminals, the home gateway (HGW) accesses the SP network through PPPoE, and at the same time provides network address translation (NAT) and dynamic host configuration service (DHCP server) functions on the HGW, and various devices in the home Obtain an IP address from the HGW through DHCP. The data of PCs in the home and various service terminals are forwarded after address translation through the HGW, as shown in Figure 2. The disadvantages of this method are: ① The service requiring QoS guarantee and the uplink channel of the data online service needing QoS guarantee are combined together. On-demand program counting) must require the user to have opened the data access service and choose an unlimited payment method, which severely limits the target user group for service development. ②All uplink data packets must be encapsulated in PPPoE packets. After aggregation at the DSLAM, since the DSLAM does not terminate PPPoE, it cannot identify the packet type in the PPPoE encapsulation, and naturally cannot provide effective QoS guarantee.

Another solution in the prior art is a modification based on the first solution: the HGW does not perform NAT conversion on the packets, and all uplink and downlink packets are directly forwarded. The PC connected to the HGW directly performs PPPoE dial-up, and the service terminal directly obtains an IP address from the network side through DHCP to access the SP network, as shown in Figure 3. This solution completely isolates the service flow sent by the service terminal and the data flow sent by the data terminal, so that the DSLAM can implement different strategies for QoS scheduling of various service flows, meeting the QoS requirements of the service terminal. The disadvantages are: ① The devices in the home obtain IP addresses from different channels, and they are in different network segments. Some are even in public network addresses, and some are in private network addresses. Various devices cannot directly communicate with each other. If they want to communicate with each other, they must go to the SP It is very complicated to realize the intercommunication on the router. ②Every device in the home is directly connected to the Internet and exposed to the public, making it difficult to guarantee security. ③Each service terminal needs to be assigned a separate public network IP address, which seriously wastes IP resources. ④ When there are multiple data terminals (such as PCs) in the home, the device needs to provide NAT function. Although this NAT can be provided by the PC that executes PPPoE dial-up, it is inconvenient after all.

[Content of the invention]

The purpose of the present invention is to provide a home gateway that can solve the defects in the prior art and a method for guaranteeing the QoS of the network service terminal in the home.

The technical solution adopted by the present invention to solve the technical problem is: a home gateway, the home gateway HGW includes a service type identifier for identifying the service type of the message, and is used to convert the source address of the message into The network address translator NAT corresponding to the public network IP address, and at least two connection channels connected to the network side equipment for carrying services, and each connection channel can obtain at least one public network IP address.

Further, one of the connection channels is used to transmit the message of the business that needs QoS guarantee, and it obtains the public network IP address IP1 or sets the public network IP address IP1 from the dynamic host address server DHCP server in DHCP mode; the other connection channel The channel is used to carry other PPPoE packets that do not require QoS guarantee, and it obtains the public network IP address IP2 from the BAS through PPPoE.

Further, the NAT is used to convert the source address of the message of the service requiring QoS guarantee to the public network address IP1 and forward it upwards, and convert the source address of the message of other service not requiring QoS guarantee to the After the public network address IP2, it is encapsulated in the PPPoE packet format and forwarded upwards.

As an improvement of the home gateway of the present invention, it also includes a priority marker, which is used to mark the message with the public network address IP1 with a different 802.1P priority according to its service type and then forward it upwards.

The present invention provides a method for guaranteeing the QoS of the network service terminal in the home based on the above-mentioned home gateway, comprising steps:

501. The HGW establishes at least two connection channels with the network side device;

502. The HGW receives the request message sent by the terminal, and assigns a private network IP address to the terminal;

503. The HGW identifies the service type, and according to the preset QoS rules, converts the source addresses of the packets of the services requiring QoS guarantee and the data services not requiring QoS guarantee into the corresponding public network IP addresses, and sends them out from the corresponding connection channels. .

In the above method, the HGW identifies the service type by checking a specific field of the message, or identifies the service type by matching the source MAC address of the terminal, or identifies the service type by matching the source/destination IP address of the terminal.

Further, in step 501, the HGW obtains the public network address IP1 or sets a fixed IP address IP1 from the DHCP server through the connection channel 1 in DHCP mode, and obtains the public network address IP2 from the broadband access system BAS in the PPPoE mode through the connection channel 2.

As an improvement of the present invention, in step 503, for services that require QoS guarantee, after the HGW converts the source address of the message to address IP1, use the VLAN ID of 802.1Q, or the priority of 802.1P, or the priority of ToS , or the DSCP priority is marked to distinguish the service type, and then sent from the connection channel 1. .

Further, in step 503, for services that do not require QoS guarantee, the HGW converts the source address of the message into address IP2, encapsulates it with PPPoE, and sends it out through connection channel 2.

As an improvement, the method of the present invention further includes: the DSLAM preferentially processes the message sent by the first connection channel.

As another improvement of the method of the present invention, the DALAM schedules the message carried by the connection channel one according to the VLAN ID of 802.1Q, or 802.1P priority, or ToS priority, or DSCP priority.

The beneficial effects of the present invention are: ① The home gateway (HGW) can identify the terminal type/service type, and support two or more connection channels, apply for a public network IP address for each channel, and PPPoE and IPoA are respectively carried on different The connection channel prevents unauthorized PC Internet users from using the uplink channel of the service terminal to access the network, so that PC Internet users can freely choose the payment method, and at the same time save IP resources. ②HGW supports the network address translation function (NAT), which can allocate the private network IP of the same network segment to each terminal device, so that the terminals can easily realize intercommunication. ③The digital subscriber access server (DSLAM) processes IPoA packets first, and at the same time schedules the IPoA packets according to the 802.1P priority marks P1 and P2, thus ensuring that voice, video, and data services can all get good QoS guarantees .

[Description of drawings]

FIG. 1 is a network diagram of an existing home network and an access network.

Fig. 2 is a schematic diagram of the first prior art.

Fig. 3 is a schematic diagram of the second prior art.

Fig. 4 is a schematic flow chart of the system and method of the present invention.

[Detailed ways]

The present invention will be further elaborated below according to the drawings and specific embodiments.

The system of the present invention is the same as in the prior art, comprising: a terminal, a home gateway (HGW), a digital subscriber access server (DSLAM), a broadband access system (BAS, Broad Access System) and a dynamic host address server (DHCP server) . Among them, the terminal mainly includes set-top box (STB), digital TV (IPTV), video phone (Video Phone), digital phone (IP Phone) and personal computer (PC). Business types mainly include data services (PC) that do not require QoS guarantees and services that require QoS guarantees (such as VoIP services, IPTV and Video Phone services). In this preferred embodiment, the present invention is mainly described by taking the data service and VoIP service of the PC as examples.

As shown in Figure 4, in the system of the present invention, the HGW includes: a service type identifier for identifying the service type to which the message belongs, and a network address translator for converting the source address of the message into a corresponding public network IP address according to the service type NAT, and at least two connection channels connected to the network side equipment for bearing services. It has the following characteristics:

(1) HGW supports dynamic host addressing service function (DHCP server), and can identify service types. For example, the terminal type can be identified according to a specific field in the DHCP message (such as DHCP Option 60), so as to identify the service type: if the DHCP request sent does not contain the Option 60 option, it is considered that the device is not a service terminal of the operator, but a data Terminal, if the message sent by the terminal has an Option60 field, the terminal type can be identified according to the data in this field. The business can be identified according to the device type, MAC address, IP address, TCP/UDP port number, application layer protocol and other information (for example, if the MAC address, IP address, TCP/UDP port number, application layer protocol If the address is consistent with the specified one, the business type can be identified to start the predetermined QoS rule).

(2) support at least two connection channels (the present invention takes two as an example), and the connection channel can be a permanent virtual connection PVC or VLAM, and connection channel one is used to bear the weight of service messages requiring QoS guarantee, and it uses DHCP mode Obtain a public network IP address IP1 from the dynamic host address server DHCP server, or set the public network IP address IP1; connection channel 2 is used to carry data services that do not require QoS guarantee, that is, PPPoE packets, which are obtained from the BAS in PPPoE mode Public network IP address IP2.

(3) Support and network address translation function (NAT), HGW converts the source address of the message of the service that needs QoS guarantee into a public network address, and marks the message with different 802.1P priority according to the type of service flow Upward forwarding, converting the source address of other data packets that do not require QoS guarantee to another public network address, encapsulating PPPoE and forwarding upwards.

The DSLAM in the system of the present invention has the following characteristics: it can identify the terminal type/service type carried by the message according to the VLAN ID of PVC, 802.1Q, or 802.1P priority, or ToS priority, or DSCP priority, and perform QoS guarantee, such as prioritizing VoIP services, scheduling voice and video services, etc.

The method of the present invention mainly includes steps: 501, the HGW establishes at least two connection channels with the network side equipment; 502, the HGW receives the request message sent by the terminal, and allocates a private network IP address belonging to the same network segment to the terminal; 503, the HGW Identify the type of business, and convert the source addresses of the packets that require QoS guarantees and data services that do not require QoS guarantees to the corresponding public network IP addresses according to the preset QoS rules, and send them out from the corresponding connection channels.

Taking the establishment of a PVC channel between the HGW and the network side equipment DSLAM as an example, the specific implementation process of the preferred embodiment of the present invention is introduced, including steps:

S1, the HGW and the DSLAM establish two permanent virtual connections PVC1 and PVC2, among which PVC1 is used to carry packets that require QoS guarantee, and PVC2 is used to carry PPPoE packets that do not require QoS guarantee;

S2, the HGW obtains the public network address IP1 from the DHCP server by way of DHCP through PVC1 (or directly sets and uses a fixed IP address IP1), and obtains the public network address IP2 from the BAS by way of PPPoE through PVC2.

S31, the STB sends a DHCP request message, and the DHCP Option 60 field in the message includes optional data A;

S32, the IP Phone sends a DHCP request message, and the DHCP Option 60 field in the message includes optional data B;

S33, the PC sends a DHCP request message, and the DHCP Option 60 field in the message does not have optional data;

S4, HGW obtains the type of terminal equipment according to the Option 60 field, assigns address IP-a to STB, assigns address IP-b to IP Phone, assigns address IP-c to PC; because IP-a, IP-b, IP-c All are private network IPs of the same network segment, and these three terminals can easily communicate with each other;

S5, the HGW judges that the service flow carried by this IP packet is a VoIP service according to the source address IP-a, converts the source address of the message to IP1 through NAT1, and adds the priority of 802.1P (it can also be 802.1Q VLAN ID, or ToS priority, or DSCP priority) mark P1; According to the source address IP-b, it is judged that the service flow carried by this IP packet is a VoIP service, and the source address of this message is converted to IP1 through NAT1, And add the priority mark P2 of 802.1P; According to the source address IP-c, it is judged that the service flow carried by this IP packet is a data service, and the source address of this message is converted to IP2 through NAT2, and PPPoE encapsulation is performed; in this way, the HGW Carry data services on PPPoE, and other services on IPoA;

S6. The HGW sends the packet processed by NAT1 from PVC1, and sends the packet processed by NAT2 from PVC2;

S7, after the DSLAM receives the message from the HGW, it first processes the message sent by the PVC1 channel, and then processes the message sent by the PVC2 channel, and at the same time schedules the IP message carried by PVC1 according to the 802.1P priority marks P1 and P2 , so as to ensure that voice, video, and data services can all get good QoS guarantees.

When the above packets are processed by the HGW, they must be buffered and scheduled in the HGW to ensure their QoS.

If there is a third service flow, the HGW can establish a PVC3 connection with the DSLAM, apply for a third public network IP address, and send the service flow through this channel.

Claims (11)

1. A home gateway, characterized in that: the home gateway HGW includes a service type identifier for identifying the service type to which the message belongs, and a network network for converting the source address of the message into a corresponding public network IP address according to the service type The address translator NAT, and at least two connection channels connected to the network side equipment for carrying services, and each connection channel can obtain at least one public network IP address. 2. The home gateway according to claim 1, characterized in that: said one of the connection channels is used to transmit packets of services requiring QoS guarantee, and obtains the public network IP from the dynamic host address server DHCP server in DHCP mode Address IP1 or set the public network IP address IP1; the other connection channel is used to carry other PPPoE packets that do not require QoS guarantee, and it obtains the public network IP address IP2 from the BAS through PPPoE. 3. The home gateway according to claim 1 or 2, characterized in that: the NAT is used to convert the source IP address of the service packet requiring QoS guarantee to the public network address IP1 and then forward it upwards, and convert the other After the source IP address of the message of the service not requiring QoS guarantee is converted to the public network address IP2, it is encapsulated in the PPPoE message format and forwarded upwards. 4. The home gateway according to claim 3, characterized in that: it also includes a priority marker, which is used to mark the message with the public network address as IP1 with a different 802.1Q VLAN ID or 802.1Q according to its service type. P priority, or ToS priority, or DSCP priority and then forwarded upwards. 5. A method for guaranteeing the QoS of a home network service terminal based on the home gateway of claim 1, characterized in that it comprises the steps of: 501. The HGW establishes at least two connection channels with the network side device; 502. The HGW receives the request message sent by the terminal, and assigns a private network IP address to the terminal; 503. The HGW identifies the service type, and according to the preset QoS rules, converts the source IP address of the packet of the service requiring QoS guarantee and the data service not requiring QoS guarantee into the corresponding public network IP address, and connects from the corresponding connection channel issue. 6. The method according to claim 5, characterized in that: the HGW identifies the service type by checking a specific field of the message, or identifies the service type by matching the source MAC address of the terminal, or identifies the service type by matching the source/destination IP address of the terminal The address identifies the type of service. 7. The method according to claim 5, characterized in that: in step 501, the HGW obtains the public network address IP1 from the DHCP server in DHCP mode through the connection channel one or sets a fixed IP address IP1, and uses the PPPoE mode through the connection channel two Obtain the public network address IP2 from the broadband access system BAS. 8. The method for guaranteeing the QoS of the home network service terminal according to claim 7, characterized in that: in step 503, for the service requiring QoS guarantee, the HGW converts the source address of the message into the address IP1, and uses 802.1Q The VLAN ID, or the priority of 802.1P, or the priority of ToS, or the priority of DSCP are marked to distinguish the service type, and then sent from the connection channel one. 9. The method for guaranteeing QoS of home network service terminals according to claim 7, characterized in that: in step 503, for data services that do not require QoS guarantee, after the HGW converts the source IP address of the message into address IP2, Use PPPoE for encapsulation, and then send out through connection channel 2. 10. The method for guaranteeing QoS of service terminals in a home network according to claim 7, further comprising: the DSLAM preferentially processes the messages sent by the first connection channel. 11. The method for guaranteeing the QoS of network service terminals in the home according to claim 8, characterized in that: the DALAM is based on the VLAN ID of 802.1Q, or the priority of 802.1P, or ToS priority, or DSCP priority for scheduling.

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